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//-----------------------------------------------------------------------------
//
// Copyright (C) Microsoft Corporation. All Rights Reserved.
//
//-----------------------------------------------------------------------------
using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Text;
using System.Diagnostics.Contracts;
using System.Globalization;
namespace Microsoft.Boogie
{
public class SExpr
{
static readonly SExpr[] EmptyArgs = new SExpr[0];
public readonly string Name;
public SExpr[] Arguments
{
get
{
Contract.Ensures(Contract.Result<SExpr[]>() != null);
Contract.Ensures(Contract.ForAll(Contract.Result<SExpr[]>(), expr => expr != null));
return this.arguments;
}
}
public SExpr this[int idx]
{
get
{
return Arguments[idx];
}
}
public int ArgCount
{
get { return arguments.Length; }
}
public bool IsId
{
get { return Arguments.Length == 0; }
}
private readonly SExpr[] arguments;
[ContractInvariantMethod]
void ObjectInvariant()
{
Contract.Invariant(this.Name != null);
Contract.Invariant(this.arguments != null);
Contract.Invariant(Contract.ForAll(this.arguments, arg => arg != null));
}
public SExpr(string name, params SExpr[] args)
: this(name, (IEnumerable<SExpr>)args)
{
Contract.Requires(name != null);
Contract.Requires(args != null);
Contract.Requires(Contract.ForAll(args, x => x != null));
}
public SExpr(string name, IEnumerable<SExpr> args)
{
Contract.Requires(name != null);
Contract.Requires(args != null);
// We don't want to evaluate args twice!
// Contract.Requires(Contract.ForAll(args, x => x != null));
Name = name;
arguments = args.ToArray();
}
public SExpr(string name)
: this(name, EmptyArgs)
{
Contract.Requires(name != null);
}
#region pretty-printing
void WriteTo(StringBuilder sb)
{
Contract.Requires(sb != null);
if (Arguments.Length > 0) sb.Append('(');
if (Name.Any(Char.IsWhiteSpace))
sb.Append("\"").Append(Name).Append("\"");
else if (Name.Length == 0)
sb.Append("()");
else
sb.Append(Name);
foreach (var a in Arguments) {
sb.Append(' ');
a.WriteTo(sb);
}
if (Arguments.Length > 0) sb.Append(')');
}
public override string ToString()
{
var sb = new StringBuilder();
this.WriteTo(sb);
return sb.ToString();
}
#endregion
#region parsing
public abstract class Parser
{
System.IO.StreamReader sr;
int linePos = 0;
string currLine = null;
public Parser(System.IO.StreamReader _sr)
{
sr = _sr;
}
string Read()
{
return sr.ReadLine();
}
char SkipWs()
{
while (true)
{
if (currLine == null)
{
currLine = Read();
if (currLine == null)
return '\0';
}
while (linePos < currLine.Length && char.IsWhiteSpace(currLine[linePos]))
linePos++;
if (linePos < currLine.Length)
return currLine[linePos];
else
{
currLine = null;
linePos = 0;
}
}
}
void Shift()
{
linePos++;
}
string ParseId()
{
var sb = new StringBuilder();
var beg = SkipWs();
var quoted = beg == '"' || beg == '|';
if (quoted)
Shift();
while (true)
{
if (linePos >= currLine.Length)
{
if (quoted)
{
sb.Append("\n");
currLine = Read();
linePos = 0;
if (currLine == null)
break;
}
else break;
}
var c = currLine[linePos++];
if (quoted && c == beg)
break;
if (!quoted && (char.IsWhiteSpace(c) || c == '(' || c == ')'))
{
linePos--;
break;
}
if (quoted && c == '\\' && linePos < currLine.Length && currLine[linePos] == '"')
{
sb.Append('"');
linePos++;
continue;
}
sb.Append(c);
}
return sb.ToString();
}
public abstract void ParseError(string msg);
public IEnumerable<SExpr> ParseSExprs(bool top)
{
while (true)
{
var c = SkipWs();
if (c == '\0')
break;
if (c == ')')
{
if (top)
ParseError("stray ')'");
break;
}
string id;
if (c == '(')
{
Shift();
c = SkipWs();
if (c == '\0')
{
ParseError("expecting something after '('");
break;
}
else if (c == '(')
{
id = "";
}
else
{
id = ParseId();
}
var args = ParseSExprs(false).ToArray();
c = SkipWs();
if (c == ')')
{
Shift();
}
else
{
ParseError("unclosed '(" + id + "'");
}
yield return new SExpr(id, args);
}
else
{
id = ParseId();
yield return new SExpr(id);
}
if (top) break;
}
}
}
#endregion
}
}
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